/* ==============================
   Scroll to top button
============================== */

.scroll-top {
  position: fixed;
  left: 24px;
  bottom: 32px;

  width: 44px;
  height: 44px;
  border-radius: 50%;

  background: #6b7280;       /* серый фон */
  color: #ffffff;            /* белый шеврон */

  border: none;
  box-shadow: none;          /* без теней */

  font-size: 16px;
  line-height: 1;

  cursor: pointer;

  display: flex;
  align-items: center;
  justify-content: center;

  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);

  transition:
    opacity 0.2s ease,
    transform 0.2s ease,
    visibility 0s linear 0.2s;

  z-index: 900;
}

/* показываем */
.scroll-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);

  transition-delay: 0s;
}

/* hover — лёгкое затемнение */
.scroll-top:hover {
  background: #4b5563;
}

/* ==============================
   Desktop only
============================== */

@media (max-width: 768px) {
  .scroll-top {
    display: none;
  }
}